Okay guys i'm going to give you all as much background info as possible.

So I'm 19 years old. I've been dating this guy for some months and whenever we have sex we dont use protection. I was on the pill but stopped taking it in either January or early February. The day before Valentine's we had sex and he came inside of me and that Sunday we got a plan b. My period had came on a week before we had sex and then the last week of February (10 days after sex), i had light bleeding that lasted about 6-7 days and my period is normally pretty heavy and only light the last couple days. So i thought that it was implantation bleeding but I know that that only lasts 2-3 days. My true period has not been on since February. So i took 3 tests that all came out negative.

My concerns are that the tests were wrong and I really am pregnant (not good) or that the tests were right and there's something wrong with me.

If you guys have any advice or idea of what could be going on, that would help a lot!